(Pl. 6D)
Echinocerus foraminatus Stimpson, 1859: 79.
Lopholithodes foraminatus. — Holmes 1900; 130. — Schmitt 1921: 157, pl. 21, fig. 2; fig. 102. — Johnson & Snook 1927: 340, figs. 288, 294. — Goodwin 1952: 176. — MacGinitie & MacGinitie 1968: 300. — Pereyra & Alton 1972: 450. — Wicksten 1980: 363. — Hart 1982: 80, fig. 24. — Wicksten 1980c: 363; 1982b: 245; 1989b: 314. — Dawson 1989: 318. — Jensen 1995: 72, fig 143. — Martin & Haney 2005: 450. — Kuris et al. 2007: 648.
Diagnosis. Carapace tuberculate, depressed; gastric region elevated, margins with low, wide spines. Rostrum short, with median spine, spiny tubercles above base. Chelipeds tuberculate, equal; with broad sinus on carpus forming, with similar sinus on pereopods 2, large respiratory opening. Pereopods 2–4 tuberculate, capable of being drawn tightly against cephalothorax. Abdomen asymmetrical, tuberculate. Carapace length to 165 mm.
Color in life. Drab reddish-brown or tan. The color notes are based on crabs trawled off southern California.
Habitat and depth. Sandy subtidal areas, rarely low intertidal zone to 547 m.
Range. Kodiak, Alaska to San Diego, California. Type locality "near San Francisco, California.” The crab often is trawled north of San Francisco.
Remarks. MacGinitie & MacGinitie (1968) gave a good account of the natural history of this burrowing crab. Martin & Haney (2005) reported this species from extinct vent sites in the Oregon Subduction Zone.